write class mark mid value of the following class interval 15 25 25 35 35 45 45 55 55 65 65 75 75 85 number of students 6,11 ,7 ,4,4,2,1
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Answer:
Mid value = 35.7
Step-by-step explanation:
Total no of students = 35
Mid value = 17.5
The class containing mid value is 3rd i.e. 35-45 as the no of students below this class are 6+11 = 17
Class width = 10 and class frequency = 7
So. the mid value = 35+10/7*(17.5-17) = 35+0.7 =35.7
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